<div class="mod_app_top_btn">
    <span class="download_app">
        <span class="download_app_wording">
            <span class="download_app_title">安装腾讯视频客户端</span>
            <span class="download_app_desc">寻找追剧粉丝一起吐槽</span>
        </span>
        <span class="download_app_btn">安装</span>
    </span>
</div>